含HCl四元水盐体系溶解度预测及其在工艺上的应用:Pitzer混合参数对HCl-MgCl_2-H_2O体系25°C时溶解度预测的影响

Prediction of Solubilities in Quaternary HCl-Salt System and Its Application in Chemical Technology: Effects of Pitzer Mixing Parameters on the Solubility Prediction of the Phase System HCl-MgCl_2-H_2O at 25°C

计算了 HCl- Mg Cl2 - H2 O体系 2 5°C时溶解度以及 θHMg和 ΨHMg Cl各以± 10 %变动时 ,HCl- Mg Cl2 - H2 O体系 2 5°C时的溶解度变化。计算的结果表明 ,H和 Mg之间的两离子相互作用和 H,Mg和 Cl之间的三离子相互作用对体系中 Mg Cl2 的溶解度有极大的影响。在 HCl的浓度最大时 ,这两种相互作用近似相等。当这两种相互作用同时增加或同时减小时 ,体系的溶解度几乎不发生变化 ;但当一种作用增加 ,另一种作用减小时 ,体系的溶解度会发生根本变化。该结果为后续工作—— H+ ,L i+ ,Mg2 + /Cl- - H2 O四元体系 2 5°C时组分溶解度预测奠定了基础 。

The paper reported the solubility prediction results of HCl-MgCl 2-H 2O system at 25°C and solubility variations of the system when θ HMg (interactions of two species with the same charge) and Ψ HMgCl (interactions of three species)were changed with +10% and -10%. The calculated results indicated that the effects of the two kinds of interactions on the solubility of the system were regularly. When the molality of the HCl was the maximal, the two interactions were nearly equal. The solubilities of the system were not varied while the two interactions were increased and decreased simultaneously. The solubilities of the system were changed greatly as one interaction was increased and the other decreased. This study is significant for the chemical technology of salting out salts from the water salt system. The study also developed and enriched the Pitzer’s theory.